CSD_TYPE_SYNC
if (csd_type == CSD_TYPE_ASYNC || csd_type == CSD_TYPE_SYNC)
case CSD_TYPE_SYNC:
if (CSD_TYPE(csd) == CSD_TYPE_SYNC) {
.node = { .u_flags = CSD_FLAG_LOCK | CSD_TYPE_SYNC, },
csd->node.u_flags |= CSD_TYPE_SYNC;